Apple is testing a hidden Siri AI voice pad in macOS 27 beta 4. When enabled, the System Settings menu for Siri voice is replaced by a dark canvas with colored dots. Pressing or moving the pointer animates colors and voice characteristics.

The pad shows 13 voices slots, hinting Apple may support up to 13 custom Siri voices. Spatial audio reacts to cursor movement, making nearby voices clearer and distant ones ambient. A spatial mixer adjusts volume, reverb, and filtering as the pointer moves.

Currently the beta lacks the full voice models, so only two custom voices are available, but a file lists 13 expected American English voices across gender, age, and character. If released, it would replace the simple slider‑based options.

The interface is localized for Nit 44 languages and shares the same Siri setup framework as iOS 27, so it may appear on iPhone and iPad. Enabling the pad requires disabling SIP and debugging, so only advanced testers can access it.